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Issue 2
4.
Bass Cut
Bass cut operating at 350Hz is selectable if required. This can be particularly advantageous to overcome the
affects of talking closely to the microphone.
5.
Limiter
Selecting the limiter will ensure that the signal level remains fairly constant irrespective of input level changes.
Using it will prevent system overload when different personnel use the microphone or speak too close to the
microphone.
Technical Specification
MICROPHONE
LINE
Nominal output level
2.5mV
250mV
Maximum output level limiter operating
7mV
700mV
Output impedance
47ohms
400ohms
Frequency Response
100Hz - 10KHz
Bass cut facility
-3dB @ 350Hz
Power Requirements
24V DC
BDM208
25mA Standby
200mA Max
BDM216
30mA Standby
345mA Max
BDM208 and 216 Connections
Both microphones are terminated to a 25 way 'D' connector. They are supplied with a BMS25 single gang socket box
and connections are made using screw terminals.
FUNCTION
CABLE COLOUR
BMS 25 CONNECTIONS
ZONE 1
Green
1
2
NPN open
Grey
2
3
collector
Pink
3
4
outputs
Orange
4
5
40V @ 100mA
Turquoise
5
6
Max. to
White/Red
6
7
zone select
White/Blue
7
8
relays etc.
Green/Red
8
9
Connects
Red/Blue
9
10
to 0V when
Yellow/Blue
10
11
the zone and
Yellow/Red
11
12
speak keys
Red/Black
12
13
are selected
Red/Brown
13
14
together or
Blue/Black
14
15
all call only
Orange/Blue
15
16
Yellow/Green
24
AUDIO - Output floating
Brown
16
CABLE SCREEN - Connect to 0V
17
AUDIO - Output floating
Blue
18
0V
Black
19
24V DC - Supply input
Red
20
ACCESS - Amplifier -
White
21
connects to 0V when speak or All Call keys are pressed. 24V @ 30mA
BUSY Indicator - Switch to 0V to illuminate
Mauve
22
